Units of pressure are :

Options

A. Newton
B. Pascal
C. Bar
D. Torr.

Explanation

To determine the units of pressure, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Pressure**:
Pressure is defined as the force applied per unit area. The formula for pressure (P) is given by:
\[ P = \frac{F}{A} \]
where \( F \) is the force and \( A \) is the area.

2. **Identify the Units of Force and Area**:
- The SI unit of force is the Newton (N).
- The SI unit of area is square meters (m²).

3. **Combine the Units**:
Using the formula for pressure, we can express the unit of pressure as:
\[ \text{Unit of Pressure} = \frac{\text{Newton}}{\text{meter}^2} = \text{N/m}^2 \]
This unit is also known as Pascal (Pa).

4. **List Other Common Units of Pressure**:
- 1 Pascal (Pa) = 1 N/m²
- 1 atmosphere (atm) = 101325 Pa
- 1 atm = 760 mmHg (Torr)
- 1 bar = 100,000 Pa = 0.9869 atm

5. **Conclusion**:
The units of pressure include Pascal (Pa), atmosphere (atm), bar, and Torr (mmHg). The Newton (N) is not a unit of pressure but rather a unit of force.

### Final Answer:
The units of pressure are: Pascal (Pa), atmosphere (atm), bar, and Torr (mmHg).

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